leetcode solutions # Title Solution Difficulty 📝 1 Two Sum CPP, PY Easy 2 Add Two Numbers C, CPP Medium 3 Longest Substring Without Repeating Characters CPP Medium 4 Median of Two Sorted Arrays C, CPP Hard 5 Longest Palindromic Substring CPP Medium note 7 Reverse Integer C Easy 8 String to Integer CPP Medium 9 Palindrome Number C Easy 10 Regular Expression Matching C Hard 11 Container With Most Water CPP Medium 14 Longest Common Prefix C Easy 17 Letter Combinations of a Phone Number CPP Medium 19 Remove Nth Node From End of List C, CPP Medium 20 Valid Parentheses C Easy 21 MergeTwoSortedLists C, CPP Easy 22 Generate Parentheses PY Medium 26 Remove Duplicates from Sorted Array C Easy 27 Remove Element C Easy 28 Implement strStr() C Easy 35 Search Insert Position C Easy 38 Count and Say C Easy 53 Maximum Subarray C Easy 58 Length of Last Word CPP Easy 61 Rotate List CPP Medium 66 Plus One CPP, C Easy 67 Add Binary C Easy 69 Sqrt(x) C Easy 70 Climbing Stairs C Easy 83 Remove Duplicates from Sorted List C, CPP Easy 88 Merge Sorted Array CPP Easy 92 Reverse Linked List II CPP Medium 94 Binary Tree Inorder Traversal C Medium 100 Same Tree C Easy 101 Symmetric Tree C Easy 104 Maximum Depth of Binary Tree C Easy 110 Balanced Binary Tree C Easy 111 Minimum Depth of Binary Tree CPP Easy 121 Best Time to Buy and Sell Stock C Easy 136 Single Number C Easy 138 Copy List with Random Pointer CPP Medium 141 Linked List Cycle C, CPP Easy 142 Linked List Cycle II CPP Medium 143 Reorder List CPP Medium 144 Binary Tree Preorder Traversal C Medium 147 Insertion Sort List CPP Medium 160 Intersection of Two Linked Lists CPP Easy 169 Majority Element CPP Easy 191 Number of 1 Bits C Easy 204 Count Primes C Easy 206 Reverse Linked List C, CPP Easy 217 Contains Duplicate CPP Easy 234 Palindrome Linked List CPP, C Easy 258 Add Digits CPP Easy 283 Move Zeroes CPP Easy 392 Is Subsequence C Easy 412 Fizz Buzz CPP Easy 416 Partition Equal Subset Sum CPP Medium 448 Find All Numbers Disappeared in an Array CPP Easy 509 Fibonacci Number CPP Easy 633 Sum of Square Numbers CPP Easy 912 Sort an Array C Medium 961 N-Repeated Element in Size 2N Array CPP Easy